Doctor profile · Federal record
Dr. Gareth Marsh, DO
Psychiatry Physician (CMS: Psychiatry) · Columbia, MO
- NPI 1124558531
- Accepts Medicare
- MIPS 83.3 / 100 · 2023
- 9 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1 Hospital Dr
Columbia, MO 652121000
(573) 882-8907
fax (573) 884-1070 - Mailing address
-
1 Hospital Drive, Dco67.00
Columbia, MO 65212
Credentials & registration
- NPI registered
- June 2017 — 9 yrs on file
- Year of graduation
- 2017 — 9 yrs since
- Specialty taxonomy
- 2084P0800X — NUCC code
- State license (1)
- Maryland #2017020205
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1124558531. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
119
Distinct HCPCS
3
Medicare allowed
$11,102
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 54 | 21 | $92 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 53 | 16 | $77 | |
99205 |
New patient office or other outpatient visit, 60-74 minutes | 12 | 12 | $170 |
In context: peer comparison
Among 16 peers in Columbia Psychiatry Physician, average services per provider: 68. This provider delivers 1.8× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
1,039
Patients
241
Total drug cost
$23,099
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Buspirone Hcl | Generic | 98 | 24 | $1,725 |
| Lorazepam | Generic | 93 | 25 | $812 |
| Escitalopram Oxalate | Generic | 84 | 15 | $706 |
| Gabapentin | Generic | 84 | 20 | $1,737 |
| Trazodone Hcl | Generic | 82 | 27 | $850 |
| Lamotrigine | Generic | 80 | 18 | $1,225 |
| Hydroxyzine Pamoate | Generic | 76 | 23 | $778 |
| Ramelteon | Generic | 72 | 19 | $6,908 |
| Desvenlafaxine Succinate ER (Desvenlafaxine Succinate) | Brand | 66 | 13 | $3,213 |
| Clonazepam | Generic | 62 | 17 | $503 |
Hospital affiliations
Frequently asked questions
What is Dr. Gareth Marsh's medical specialty?
Dr. Gareth Marsh practices Psychiatry Physician in Columbia, MO.
Where does Dr. Gareth Marsh practice?
Dr. Gareth Marsh practices at 1 Hospital Dr, Columbia, MO 652121000. Office phone: 5738828907.
What is Dr. Gareth Marsh's NPI?
Dr. Gareth Marsh's National Provider Identifier (NPI) is 1124558531, issued by NPPES.
Does Dr. Gareth Marsh accept Medicare assignment?
Yes. Dr. Gareth Marsh accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Gareth Marsh commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Established patient office or other outpatient visit (HCPCS 99214); New patient office or other outpatient visit (HCPCS 99205). Source: CMS Medicare Physician & Other Practitioners file.